M365EXO-035: No IP allow list in connection filter (MS.EXO.12.1)
- Plataforma
- Entra ID / M365
- Categoría
- Advanced Threat Protection
- Severidad
- High
- Pilar de Zero Trust
- Applications & Workloads (peso 2)
- Fixtures de referencia
- 3
- Cobertura de ramas
- Observada: los fixtures prueban los veredictos que ejercitan
- Procedencia
- baseline
Qué comprueba
SCuBA MS.EXO.12.1 recommends that IP allow lists not be created. Addresses on the connection filter allow list bypass spam filtering, SPF, DKIM, DMARC, and FROM-address enforcement. Any entry on this list is a hole through which an attacker who can send from that address can deliver mail that skips all inbound security controls.
Valor recomendado
Connection filter policy IPAllowList empty for all policies
Remediación
Edit the connection filter policy and remove all entries from the allowed IP address list so no senders bypass spam filtering and authentication checks. If a sender must be allowed to avoid false positives, prefer a narrowly scoped allowed-sender entry over an IP allow list. Verify no custom connection filter policy reintroduces allow-list entries.
Veredictos probados con fixtures
Cada veredicto de esta tabla está probado por un fixture de referencia en la suite de pruebas que valida el módulo. La tabla se deriva de la última ejecución en verde; no puede editarse a mano.
| Escenario | Veredicto esperado |
|---|---|
| clean | PASS |
| known-bad | FAIL |
| throttled | Not Assessed |
Mapeos a marcos de referencia
- NIST SP 800-53
- SC-7, SI-8
- CIS M365 Benchmark
- 2.1.12
- MITRE ATT&CK
- T1566.001